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[PATCH] xen/dt: Don't advertise Xen static-heap region to hwdom
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Thu, 29 Oct 2026 11:43:05 +0100
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- Cc: Michal Orzel <michal.orzel@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>
- Delivery-date: Thu, 29 Oct 2026 10:43:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
bootinfo.reserved_mem is used to store different types of memory that
Xen considers as reserved: domU static mem, normal /reserved-memory,
FDT memreserve and Xen static heap. make_memory_node(), invoked during
FDT generation for a hwdom for reserved memory, only skips the domU
static memory and FDT memreserve. This results in advertising Xen static
heap (if used) to a hwdom as /memory. This memory is not mapped in P2M
and guest attempt to access it fails. Interestingly, if the
/reserved-memory node is placed after /chosen, there is no problem because
of the check at the beginning of make_memory_node() that finds the first
memory range using the correct type.
Fixes: 4596329291f5 ("docs, xen/arm: Introduce static heap memory")
Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
---
xen/common/device-tree/domain-build.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/xen/common/device-tree/domain-build.c
b/xen/common/device-tree/domain-build.c
index 30a59abfa722..634a26946c24 100644
--- a/xen/common/device-tree/domain-build.c
+++ b/xen/common/device-tree/domain-build.c
@@ -541,8 +541,7 @@ int __init make_memory_node(const struct kernel_info
*kinfo, int addrcells,
u64 start = mem->bank[i].start;
u64 size = mem->bank[i].size;
- if ( (mem->bank[i].type == MEMBANK_STATIC_DOMAIN) ||
- (mem->bank[i].type == MEMBANK_FDT_RESVMEM) )
+ if ( mem->bank[i].type != MEMBANK_DEFAULT )
continue;
nr_cells += reg_size;
--
2.43.0
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